A Thank you for writing, and it's great that the melanoma was removed at an early stage — that's the main thing.
Now to the point: yes, hair transplantation to this area is entirely possible, even if the skin there is slightly thinner than the rest of the head. The fact that the area has blood flow and has healed well is a very good sign. Usually, it is precisely these areas that are suitable for transplantation.
By the way, even scar tissue can be transplanted with hair — this is done quite often. But it is important to understand that in such cases, the percentage of engraftment may be slightly lower because the blood supply in scar tissue is weaker. In rare cases, with very poor blood flow, even localised tissue death (necrosis) is possible — that is why such areas need to be evaluated particularly carefully.
It all comes down to several factors:
How pronounced the scar itself is
Its thickness and elasticity
The general condition of the skin and the body
And, of course, who performs the transplant and how
For our part, we can say that we have performed transplant operations on scarred areas many times and know how to work with them as delicately and effectively as possible.